建立了非线性化学指纹图谱法测定啤酒中乙醇的方法.取4份5mL啤酒标样,分别加入0,1,2和4 mL5％的乙醇,再分别加入20 mL 1 mol/L H2SO4、4 mL 1.25 mol/L丙二酸、3 mL 0.1 mol/L硫酸铈铵,以水定容至52 mL.在37.0℃,850 r/min反应条件下,...建立了非线性化学指纹图谱法测定啤酒中乙醇的方法.取4份5mL啤酒标样,分别加入0,1,2和4 mL5％的乙醇,再分别加入20 mL 1 mol/L H2SO4、4 mL 1.25 mol/L丙二酸、3 mL 0.1 mol/L硫酸铈铵,以水定容至52 mL.在37.0℃,850 r/min反应条件下,恒速搅拌4 min,快速注入8 mL 0.8 mol/L NaBrO3,记录非线性化学指纹图谱.利用其最大波幅和乙醇含量拟合得出线性回归方程,用于测定其它啤酒中乙醇的含量.结果表明,在一定的浓度范围内,乙醇的浓度与最大波幅值线性关系良好,相关系数R为0.9989～0.9996,样品加标回收率为97.1％ ～ 102.0％,RSD为0.4％～1.7％.本方法快速、简便、重现性好、精密度高,是一种切实可行的测定啤酒乙醇含量的新方法,也可为复杂样品中其它成分的测定提供借鉴手段.展开更多
To support modular fixture assembly design in virtual environment,a multi-view based modular fixture virtual assembly model is proposed.Instead of squeezing all assembly related information into a single model,three c...To support modular fixture assembly design in virtual environment,a multi-view based modular fixture virtual assembly model is proposed.Instead of squeezing all assembly related information into a single model,three complementary views of assembly model,element information,function and structure,and assembly relationship are proposed to be used.The first view contains the detailed element information,while the other two explicitly capture the hierarchical function relationships and mating relationships respectively.These views are complementary in the sense that each view only contains a specific aspect of assembly related information while together they include required assembly related information.The proposed assembly model is specialized to accommodate the features of modular fixture virtual assembly design and applied in our developed prototype system.展开更多
How to integrate and disseminate globally distributed multi-source and heterogeneous spatial information is an open problem in integration and sharing service of geographic information. Here we propose a new service a...How to integrate and disseminate globally distributed multi-source and heterogeneous spatial information is an open problem in integration and sharing service of geographic information. Here we propose a new service architecture suitable for integra- tion and sharing of distributed multi-source geographic information. We also propose a global virtual pyramid model, which can be applied in 3D virtual globes. In view of the difficulty of web multi-node geographic information sharing service, we propose a web multi-node service aggregation method, integrated in our autonomously developed virtual globe platform Geo- Globe and introduced in the National Platform for Common GeoSpatial Information Services named ＂T1ANDITU＂. It achieves 2D and 3D integration for geographic information service.展开更多
文摘To support modular fixture assembly design in virtual environment,a multi-view based modular fixture virtual assembly model is proposed.Instead of squeezing all assembly related information into a single model,three complementary views of assembly model,element information,function and structure,and assembly relationship are proposed to be used.The first view contains the detailed element information,while the other two explicitly capture the hierarchical function relationships and mating relationships respectively.These views are complementary in the sense that each view only contains a specific aspect of assembly related information while together they include required assembly related information.The proposed assembly model is specialized to accommodate the features of modular fixture virtual assembly design and applied in our developed prototype system.
基金supported by the National Natural Science Foundation of China(Grant No.41023001)National Basic Research Program of China(Grant No.2012CB719906)Innovative Research Groups Supported Project of the National Natural Science Foundation of China(Grant No.41021061)
文摘How to integrate and disseminate globally distributed multi-source and heterogeneous spatial information is an open problem in integration and sharing service of geographic information. Here we propose a new service architecture suitable for integra- tion and sharing of distributed multi-source geographic information. We also propose a global virtual pyramid model, which can be applied in 3D virtual globes. In view of the difficulty of web multi-node geographic information sharing service, we propose a web multi-node service aggregation method, integrated in our autonomously developed virtual globe platform Geo- Globe and introduced in the National Platform for Common GeoSpatial Information Services named ＂T1ANDITU＂. It achieves 2D and 3D integration for geographic information service.
